<?php

if (!function_exists('bzcompress')) {
    trigger_error('bzip2 functions are not available', E_USER_ERROR);
    return 0;
}

class ADODB_Compress_Bzip2 {

    var $_block_size = null;
    var $_work_level = null;
    var $_min_length = 1;

    function getBlockSize() {
        return $this->_block_size;
    }

    function setBlockSize($block_size) {
        assert('$block_size >= 1');
        assert('$block_size <= 9');
        $this->_block_size = (int) $block_size;
    }

    function getWorkLevel() {
        return $this->_work_level;
    }

    function setWorkLevel($work_level) {
        assert('$work_level >= 0');
        assert('$work_level <= 250');
        $this->_work_level = (int) $work_level;
    }

    function getMinLength() {
        return $this->_min_length;
    }

    function setMinLength($min_length) {
        assert('$min_length >= 0');
        $this->_min_length = (int) $min_length;
    }

    function ADODB_Compress_Bzip2($block_size = null, $work_level = null, $min_length = null) {
        if (!is_null($block_size)) {
            $this->setBlockSize($block_size);
        }

        if (!is_null($work_level)) {
            $this->setWorkLevel($work_level);
        }

        if (!is_null($min_length)) {
            $this->setMinLength($min_length);
        }
    }

    function write($data, $key) {
        if (strlen($data) < $this->_min_length) {
            return $data;
        }

        if (!is_null($this->_block_size)) {
            if (!is_null($this->_work_level)) {
                return bzcompress($data, $this->_block_size, $this->_work_level);
            } else {
                return bzcompress($data, $this->_block_size);
            }
        }

        return bzcompress($data);
    }

    function read($data, $key) {
        return $data ? bzdecompress($data) : $data;
    }

}

return 1;
?>
